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221 lines
8.3 KiB
Python
221 lines
8.3 KiB
Python
from . import util
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import importlib
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from importlib import _bootstrap
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from importlib import machinery
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import sys
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from test import support
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import types
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import unittest
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class ImportModuleTests(unittest.TestCase):
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"""Test importlib.import_module."""
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def test_module_import(self):
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# Test importing a top-level module.
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with util.mock_modules('top_level') as mock:
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with util.import_state(meta_path=[mock]):
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module = importlib.import_module('top_level')
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self.assertEqual(module.__name__, 'top_level')
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def test_absolute_package_import(self):
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# Test importing a module from a package with an absolute name.
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pkg_name = 'pkg'
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pkg_long_name = '{0}.__init__'.format(pkg_name)
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name = '{0}.mod'.format(pkg_name)
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with util.mock_modules(pkg_long_name, name) as mock:
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with util.import_state(meta_path=[mock]):
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module = importlib.import_module(name)
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self.assertEqual(module.__name__, name)
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def test_shallow_relative_package_import(self):
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# Test importing a module from a package through a relative import.
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pkg_name = 'pkg'
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pkg_long_name = '{0}.__init__'.format(pkg_name)
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module_name = 'mod'
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absolute_name = '{0}.{1}'.format(pkg_name, module_name)
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relative_name = '.{0}'.format(module_name)
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with util.mock_modules(pkg_long_name, absolute_name) as mock:
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with util.import_state(meta_path=[mock]):
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importlib.import_module(pkg_name)
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module = importlib.import_module(relative_name, pkg_name)
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self.assertEqual(module.__name__, absolute_name)
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def test_deep_relative_package_import(self):
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modules = ['a.__init__', 'a.b.__init__', 'a.c']
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with util.mock_modules(*modules) as mock:
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with util.import_state(meta_path=[mock]):
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importlib.import_module('a')
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importlib.import_module('a.b')
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module = importlib.import_module('..c', 'a.b')
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self.assertEqual(module.__name__, 'a.c')
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def test_absolute_import_with_package(self):
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# Test importing a module from a package with an absolute name with
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# the 'package' argument given.
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pkg_name = 'pkg'
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pkg_long_name = '{0}.__init__'.format(pkg_name)
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name = '{0}.mod'.format(pkg_name)
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with util.mock_modules(pkg_long_name, name) as mock:
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with util.import_state(meta_path=[mock]):
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importlib.import_module(pkg_name)
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module = importlib.import_module(name, pkg_name)
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self.assertEqual(module.__name__, name)
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def test_relative_import_wo_package(self):
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# Relative imports cannot happen without the 'package' argument being
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# set.
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with self.assertRaises(TypeError):
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importlib.import_module('.support')
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def test_loaded_once(self):
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# Issue #13591: Modules should only be loaded once when
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# initializing the parent package attempts to import the
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# module currently being imported.
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b_load_count = 0
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def load_a():
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importlib.import_module('a.b')
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def load_b():
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nonlocal b_load_count
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b_load_count += 1
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code = {'a': load_a, 'a.b': load_b}
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modules = ['a.__init__', 'a.b']
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with util.mock_modules(*modules, module_code=code) as mock:
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with util.import_state(meta_path=[mock]):
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importlib.import_module('a.b')
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self.assertEqual(b_load_count, 1)
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class FindLoaderTests(unittest.TestCase):
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class FakeMetaFinder:
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@staticmethod
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def find_module(name, path=None): return name, path
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def test_sys_modules(self):
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# If a module with __loader__ is in sys.modules, then return it.
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name = 'some_mod'
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with util.uncache(name):
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module = types.ModuleType(name)
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loader = 'a loader!'
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module.__loader__ = loader
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sys.modules[name] = module
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found = importlib.find_loader(name)
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self.assertEqual(loader, found)
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def test_sys_modules_loader_is_None(self):
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# If sys.modules[name].__loader__ is None, raise ValueError.
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name = 'some_mod'
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with util.uncache(name):
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module = types.ModuleType(name)
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module.__loader__ = None
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sys.modules[name] = module
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with self.assertRaises(ValueError):
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importlib.find_loader(name)
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def test_sys_modules_loader_is_not_set(self):
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# Should raise ValueError
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# Issue #17099
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name = 'some_mod'
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with util.uncache(name):
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module = types.ModuleType(name)
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try:
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del module.__loader__
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except AttributeError:
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pass
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sys.modules[name] = module
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with self.assertRaises(ValueError):
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importlib.find_loader(name)
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def test_success(self):
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# Return the loader found on sys.meta_path.
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name = 'some_mod'
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with util.uncache(name):
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with util.import_state(meta_path=[self.FakeMetaFinder]):
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self.assertEqual((name, None), importlib.find_loader(name))
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def test_success_path(self):
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# Searching on a path should work.
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name = 'some_mod'
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path = 'path to some place'
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with util.uncache(name):
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with util.import_state(meta_path=[self.FakeMetaFinder]):
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self.assertEqual((name, path),
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importlib.find_loader(name, path))
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def test_nothing(self):
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# None is returned upon failure to find a loader.
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self.assertIsNone(importlib.find_loader('nevergoingtofindthismodule'))
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class ReloadTests(unittest.TestCase):
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"""Test module reloading for builtin and extension modules."""
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def test_reload_modules(self):
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for mod in ('tokenize', 'time', 'marshal'):
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with self.subTest(module=mod):
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with support.CleanImport(mod):
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module = importlib.import_module(mod)
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importlib.reload(module)
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class InvalidateCacheTests(unittest.TestCase):
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def test_method_called(self):
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# If defined the method should be called.
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class InvalidatingNullFinder:
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def __init__(self, *ignored):
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self.called = False
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def find_module(self, *args):
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return None
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def invalidate_caches(self):
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self.called = True
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key = 'gobledeegook'
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meta_ins = InvalidatingNullFinder()
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path_ins = InvalidatingNullFinder()
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sys.meta_path.insert(0, meta_ins)
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self.addCleanup(lambda: sys.path_importer_cache.__delitem__(key))
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sys.path_importer_cache[key] = path_ins
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self.addCleanup(lambda: sys.meta_path.remove(meta_ins))
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importlib.invalidate_caches()
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self.assertTrue(meta_ins.called)
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self.assertTrue(path_ins.called)
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def test_method_lacking(self):
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# There should be no issues if the method is not defined.
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key = 'gobbledeegook'
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sys.path_importer_cache[key] = None
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self.addCleanup(lambda: sys.path_importer_cache.__delitem__(key))
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importlib.invalidate_caches() # Shouldn't trigger an exception.
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class FrozenImportlibTests(unittest.TestCase):
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def test_no_frozen_importlib(self):
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# Should be able to import w/o _frozen_importlib being defined.
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module = support.import_fresh_module('importlib', blocked=['_frozen_importlib'])
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self.assertFalse(isinstance(module.__loader__,
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machinery.FrozenImporter))
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class StartupTests(unittest.TestCase):
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def test_everyone_has___loader__(self):
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# Issue #17098: all modules should have __loader__ defined.
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for name, module in sys.modules.items():
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if isinstance(module, types.ModuleType):
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self.assertTrue(hasattr(module, '__loader__'),
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'{!r} lacks a __loader__ attribute'.format(name))
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if importlib.machinery.BuiltinImporter.find_module(name):
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self.assertIsNot(module.__loader__, None)
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elif importlib.machinery.FrozenImporter.find_module(name):
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self.assertIsNot(module.__loader__, None)
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if __name__ == '__main__':
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unittest.main()
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